Would it be better? This is what exists in Windy now, compared to the Google map and its satellite images:

Windy's Map:

Google's Map:

Google's Satellite:

Then when you zoom out a bit:

Windy's Map:

Google's Map:

Google's Satellite:

But when you zoom out further the overlay colors will washout the satellite image's colors. Meanwhile the essential geographic features are still visible in Windy anyway for weather-related purposes:

The satellite image is going to be covered with a colored wash from the overlay on top, but it will also interfere with the overlay's color display and detail if there's a transparency factor used to show both of them (maybe a slider to find the best mix of the two):

But Windy is already displaying the major topographical and human features anyway through the weather overlay - in this case the 'Rain Accumulation' overlay:

Would a satellite background be better for weather forecast detail? Probably not.

But a satellite background sure would look good behind some overlays like clouds and snow for instance if there was transparency where no information was being displayed (plus an On/Off button for the satellite layer).

@tsc
Hi,
You have the choice to use the default map or a satellite view.
Just select Settings and scroll down the list. Then change the Background map type.
But both background maps are only available at low zoom levels.

As @WXcycles said, I do not see the benefit of using this map type. But you may prefer it...